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[OMPIRBuilder] Don't discard the debug record from entry block. (llvm#135161)
When we get a function back from `CodeExtractor`, we discard its entry block after coping its instructions into the entry block we prepared. While copying the instructions, the terminator is discarded for obvious reasons. But if there were some debug values attached to the terminator, those are useful and needs to be copied.
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‎clang/test/OpenMP/irbuilder_nested_parallel_for.c

Lines changed: 18 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1679,6 +1679,9 @@ void parallel_for_2(float *r, int a, double b) {
16791679
// CHECK-DEBUG-NEXT: [[TMP1:%.*]] = load i32, ptr [[TID_ADDR]], align 4
16801680
// CHECK-DEBUG-NEXT: store i32 [[TMP1]], ptr [[TID_ADDR_LOCAL]], align 4
16811681
// CHECK-DEBUG-NEXT: [[TID:%.*]] = load i32, ptr [[TID_ADDR_LOCAL]], align 4
1682+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_A_ADDR]], [[META88:![0-9]+]], !DIExpression(), [[META89:![0-9]+]])
1683+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_B_ADDR]], [[META90:![0-9]+]], !DIExpression(), [[META91:![0-9]+]])
1684+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_R_ADDR]], [[META92:![0-9]+]], !DIExpression(), [[META93:![0-9]+]])
16821685
// CHECK-DEBUG-NEXT: br label [[OMP_PAR_REGION:%.*]]
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// CHECK-DEBUG: omp.par.region:
16841687
// CHECK-DEBUG-NEXT: [[OMP_GLOBAL_THREAD_NUM1:%.*]] = call i32 @__kmpc_global_thread_num(ptr @[[GLOB8:[0-9]+]]), !dbg [[DBG86:![0-9]+]]
@@ -1723,6 +1726,9 @@ void parallel_for_2(float *r, int a, double b) {
17231726
// CHECK-DEBUG-NEXT: [[AGG_CAPTURED:%.*]] = alloca [[STRUCT_ANON_1:%.*]], align 8
17241727
// CHECK-DEBUG-NEXT: [[AGG_CAPTURED12:%.*]] = alloca [[STRUCT_ANON_2:%.*]], align 4
17251728
// CHECK-DEBUG-NEXT: [[DOTCOUNT_ADDR:%.*]] = alloca i32, align 4
1729+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_A_ADDR]], [[META102:![0-9]+]], !DIExpression(), [[META103:![0-9]+]])
1730+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_B_ADDR]], [[META104:![0-9]+]], !DIExpression(), [[META105:![0-9]+]])
1731+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_R_ADDR]], [[META106:![0-9]+]], !DIExpression(), [[META107:![0-9]+]])
17261732
// CHECK-DEBUG-NEXT: br label [[OMP_PAR_REGION5:%.*]]
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// CHECK-DEBUG: omp.par.region5:
17281734
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[I]], [[META94:![0-9]+]], !DIExpression(), [[META99:![0-9]+]])
@@ -1964,6 +1970,9 @@ void parallel_for_2(float *r, int a, double b) {
19641970
// CHECK-DEBUG-NEXT: [[AGG_CAPTURED161:%.*]] = alloca [[STRUCT_ANON_15:%.*]], align 8
19651971
// CHECK-DEBUG-NEXT: [[AGG_CAPTURED162:%.*]] = alloca [[STRUCT_ANON_16:%.*]], align 4
19661972
// CHECK-DEBUG-NEXT: [[DOTCOUNT_ADDR163:%.*]] = alloca i32, align 4
1973+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_A_ADDR]], [[META171:![0-9]+]], !DIExpression(), [[META172:![0-9]+]])
1974+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_B_ADDR]], [[META173:![0-9]+]], !DIExpression(), [[META174:![0-9]+]])
1975+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_R_ADDR]], [[META175:![0-9]+]], !DIExpression(), [[META176:![0-9]+]])
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// CHECK-DEBUG-NEXT: br label [[OMP_PAR_REGION:%.*]]
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// CHECK-DEBUG: omp.par.region:
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// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[I]], [[META157:![0-9]+]], !DIExpression(), [[META161:![0-9]+]])
@@ -2122,6 +2131,9 @@ void parallel_for_2(float *r, int a, double b) {
21222131
// CHECK-DEBUG-NEXT: [[AGG_CAPTURED136:%.*]] = alloca [[STRUCT_ANON_13:%.*]], align 8
21232132
// CHECK-DEBUG-NEXT: [[AGG_CAPTURED137:%.*]] = alloca [[STRUCT_ANON_14:%.*]], align 4
21242133
// CHECK-DEBUG-NEXT: [[DOTCOUNT_ADDR138:%.*]] = alloca i32, align 4
2134+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_A_ADDR]], [[META207:![0-9]+]], !DIExpression(), [[META208:![0-9]+]])
2135+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_B_ADDR]], [[META209:![0-9]+]], !DIExpression(), [[META210:![0-9]+]])
2136+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_R_ADDR]], [[META211:![0-9]+]], !DIExpression(), [[META212:![0-9]+]])
21252137
// CHECK-DEBUG-NEXT: br label [[OMP_PAR_REGION9:%.*]]
21262138
// CHECK-DEBUG: omp.par.region9:
21272139
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[I16]], [[META187:![0-9]+]], !DIExpression(), [[META192:![0-9]+]])
@@ -2322,6 +2334,9 @@ void parallel_for_2(float *r, int a, double b) {
23222334
// CHECK-DEBUG-NEXT: [[AGG_CAPTURED111:%.*]] = alloca [[STRUCT_ANON_11:%.*]], align 8
23232335
// CHECK-DEBUG-NEXT: [[AGG_CAPTURED112:%.*]] = alloca [[STRUCT_ANON_12:%.*]], align 4
23242336
// CHECK-DEBUG-NEXT: [[DOTCOUNT_ADDR113:%.*]] = alloca i32, align 4
2337+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_A_ADDR]], [[META260:![0-9]+]], !DIExpression(), [[META261:![0-9]+]])
2338+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_B_ADDR]], [[META262:![0-9]+]], !DIExpression(), [[META263:![0-9]+]])
2339+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_R_ADDR]], [[META264:![0-9]+]], !DIExpression(), [[META265:![0-9]+]])
23252340
// CHECK-DEBUG-NEXT: br label [[OMP_PAR_REGION103:%.*]]
23262341
// CHECK-DEBUG: omp.par.region103:
23272342
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[I110]], [[META234:![0-9]+]], !DIExpression(), [[META240:![0-9]+]])
@@ -2402,6 +2417,9 @@ void parallel_for_2(float *r, int a, double b) {
24022417
// CHECK-DEBUG-NEXT: [[AGG_CAPTURED52:%.*]] = alloca [[STRUCT_ANON_7:%.*]], align 8
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// CHECK-DEBUG-NEXT: [[AGG_CAPTURED53:%.*]] = alloca [[STRUCT_ANON_8:%.*]], align 4
24042419
// CHECK-DEBUG-NEXT: [[DOTCOUNT_ADDR54:%.*]] = alloca i32, align 4
2420+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_A_ADDR]], [[META282:![0-9]+]], !DIExpression(), [[META283:![0-9]+]])
2421+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_B_ADDR]], [[META284:![0-9]+]], !DIExpression(), [[META285:![0-9]+]])
2422+
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[LOADGEP_R_ADDR]], [[META286:![0-9]+]], !DIExpression(), [[META287:![0-9]+]])
24052423
// CHECK-DEBUG-NEXT: br label [[OMP_PAR_REGION44:%.*]]
24062424
// CHECK-DEBUG: omp.par.region44:
24072425
// CHECK-DEBUG-NEXT: #dbg_declare(ptr [[I51]], [[META250:![0-9]+]], !DIExpression(), [[META256:![0-9]+]])

‎clang/test/OpenMP/nested_loop_codegen.cpp

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -889,6 +889,8 @@ int inline_decl() {
889889
// CHECK4-NEXT: [[AGG_CAPTURED:%.*]] = alloca [[STRUCT_ANON:%.*]], align 8
890890
// CHECK4-NEXT: [[AGG_CAPTURED1:%.*]] = alloca [[STRUCT_ANON_0:%.*]], align 4
891891
// CHECK4-NEXT: [[DOTCOUNT_ADDR:%.*]] = alloca i32, align 4
892+
// CHECK4-NEXT: #dbg_declare(ptr [[LOADGEP_I]], [[META24:![0-9]+]], !DIExpression(), [[META25:![0-9]+]])
893+
// CHECK4-NEXT: #dbg_declare(ptr [[LOADGEP_K]], [[META26:![0-9]+]], !DIExpression(), [[META25]])
892894
// CHECK4-NEXT: br label [[OMP_PAR_REGION:%.*]]
893895
// CHECK4: omp.par.region:
894896
// CHECK4-NEXT: store i32 0, ptr [[LOADGEP_I]], align 4, !dbg [[DBG23:![0-9]+]]
@@ -1066,6 +1068,8 @@ int inline_decl() {
10661068
// CHECK4-NEXT: [[AGG_CAPTURED:%.*]] = alloca [[STRUCT_ANON_1:%.*]], align 8
10671069
// CHECK4-NEXT: [[AGG_CAPTURED1:%.*]] = alloca [[STRUCT_ANON_2:%.*]], align 4
10681070
// CHECK4-NEXT: [[DOTCOUNT_ADDR:%.*]] = alloca i32, align 4
1071+
// CHECK4-NEXT: #dbg_declare(ptr [[LOADGEP_I]], [[META91:![0-9]+]], !DIExpression(), [[META92:![0-9]+]])
1072+
// CHECK4-NEXT: #dbg_declare(ptr [[LOADGEP_RES]], [[META93:![0-9]+]], !DIExpression(), [[META92]])
10691073
// CHECK4-NEXT: br label [[OMP_PAR_REGION:%.*]]
10701074
// CHECK4: omp.par.region:
10711075
// CHECK4-NEXT: store i32 0, ptr [[LOADGEP_I]], align 4, !dbg [[DBG86:![0-9]+]]

‎clang/test/OpenMP/parallel_codegen.cpp

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -893,6 +893,7 @@ int main (int argc, char **argv) {
893893
// CHECK4-NEXT: [[TMP1:%.*]] = load i32, ptr [[TID_ADDR]], align 4
894894
// CHECK4-NEXT: store i32 [[TMP1]], ptr [[TID_ADDR_LOCAL]], align 4
895895
// CHECK4-NEXT: [[TID:%.*]] = load i32, ptr [[TID_ADDR_LOCAL]], align 4
896+
// CHECK4-NEXT: #dbg_declare(ptr [[LOADGEP_VLA]], [[META36:![0-9]+]], !DIExpression(), [[META37:![0-9]+]])
896897
// CHECK4-NEXT: br label [[OMP_PAR_REGION:%.*]]
897898
// CHECK4: omp.par.region:
898899
// CHECK4-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[LOADGEP_VLA]], i64 1, !dbg [[DBG35:![0-9]+]]
@@ -960,6 +961,7 @@ int main (int argc, char **argv) {
960961
// CHECK4-NEXT: [[TID:%.*]] = load i32, ptr [[TID_ADDR_LOCAL]], align 4
961962
// CHECK4-NEXT: [[VAR:%.*]] = alloca ptr, align 8
962963
// CHECK4-NEXT: [[TMP2:%.*]] = load i64, ptr [[LOADGEP__RELOADED]], align 8
964+
// CHECK4-NEXT: #dbg_declare(ptr [[LOADGEP_ARGC_ADDR]], [[META60:![0-9]+]], !DIExpression(), [[META61:![0-9]+]])
963965
// CHECK4-NEXT: br label [[OMP_PAR_REGION:%.*]]
964966
// CHECK4: omp.par.region:
965967
// CHECK4-NEXT: [[TMP3:%.*]] = load ptr, ptr [[LOADGEP_ARGC_ADDR]], align 8, !dbg [[DBG56:![0-9]+]]

‎llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -788,8 +788,13 @@ void OpenMPIRBuilder::finalize(Function *Fn) {
788788
Instruction &I = *It;
789789
It++;
790790

791-
if (I.isTerminator())
791+
if (I.isTerminator()) {
792+
// Absorb any debug value that terminator may have
793+
if (OI.EntryBB->getTerminator())
794+
OI.EntryBB->getTerminator()->adoptDbgRecords(
795+
&ArtificialEntry, I.getIterator(), false);
792796
continue;
797+
}
793798

794799
I.moveBeforePreserving(*OI.EntryBB, OI.EntryBB->getFirstInsertionPt());
795800
}

‎mlir/test/Target/LLVMIR/omptarget-parallel-llvm-debug.mlir

Lines changed: 43 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,43 @@
1+
// RUN: mlir-translate -mlir-to-llvmir %s | FileCheck %s
2+
3+
4+
#di_file = #llvm.di_file<"target.f90" in "">
5+
#di_null_type = #llvm.di_null_type
6+
#cu = #llvm.di_compile_unit<id = distinct[0]<>, sourceLanguage = DW_LANG_Fortran95, file = #di_file, producer = "flang", isOptimized = false, emissionKind = Full>
7+
#sp_ty = #llvm.di_subroutine_type<callingConvention = DW_CC_program, types = #di_null_type>
8+
#sp = #llvm.di_subprogram<compileUnit = #cu, scope = #di_file, name = "test", file = #di_file, subprogramFlags = "Definition", type = #sp_ty>
9+
#int_ty = #llvm.di_basic_type<tag = DW_TAG_base_type, name = "integer", sizeInBits = 32, encoding = DW_ATE_signed>
10+
#var_x = #llvm.di_local_variable<scope = #sp, name = "x", file = #di_file, type = #int_ty>
11+
module attributes {dlti.dl_spec = #dlti.dl_spec<i32 = dense<32> : vector<2xi64>, f16 = dense<16> : vector<2xi64>, f64 = dense<64> : vector<2xi64>, f128 = dense<128> : vector<2xi64>, i128 = dense<128> : vector<2xi64>, i64 = dense<64> : vector<2xi64>, f80 = dense<128> : vector<2xi64>, !llvm.ptr<272> = dense<64> : vector<4xi64>, !llvm.ptr<271> = dense<32> : vector<4xi64>, !llvm.ptr = dense<64> : vector<4xi64>, !llvm.ptr<270> = dense<32> : vector<4xi64>, i1 = dense<8> : vector<2xi64>, i8 = dense<8> : vector<2xi64>, i16 = dense<16> : vector<2xi64>, "dlti.endianness" = "little", "dlti.stack_alignment" = 128 : i64, "dlti.mangling_mode" = "e">, fir.defaultkind = "a1c4d8i4l4r4", fir.kindmap = "", fir.target_cpu = "x86-64", llvm.data_layout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128", llvm.ident = "flang version 21.0.0 (/home/haqadeer/work/src/aomp-llvm-project/flang 793f9220ab32f92fc3b253efec2e332c18090e53)", llvm.target_triple = "x86_64-unknown-linux-gnu", omp.is_gpu = false, omp.is_target_device = false, omp.requires = #omp<clause_requires none>, omp.target_triples = ["amdgcn-amd-amdhsa"], omp.version = #omp.version<version = 52>} {
12+
llvm.func @_QQmain() attributes {fir.bindc_name = "test", frame_pointer = #llvm.framePointerKind<all>, target_cpu = "x86-64"} {
13+
%0 = llvm.mlir.constant(1 : i64) : i64
14+
%1 = llvm.alloca %0 x i32 {bindc_name = "x"} : (i64) -> !llvm.ptr
15+
llvm.intr.dbg.declare #var_x = %1 : !llvm.ptr loc(#loc2)
16+
%5 = omp.map.info var_ptr(%1 : !llvm.ptr, i32) map_clauses(implicit, exit_release_or_enter_alloc) capture(ByCopy) -> !llvm.ptr {name = "x"}
17+
omp.target map_entries(%5 -> %arg0 : !llvm.ptr) {
18+
%6 = llvm.mlir.constant(1 : i32) : i32
19+
llvm.intr.dbg.declare #var_x = %arg0 : !llvm.ptr loc(#loc2)
20+
omp.parallel {
21+
%7 = llvm.load %arg0 : !llvm.ptr -> i32
22+
%8 = llvm.add %7, %6 : i32
23+
llvm.store %8, %arg0 : i32, !llvm.ptr
24+
omp.terminator
25+
}
26+
omp.terminator
27+
}
28+
llvm.return
29+
} loc(#loc10)
30+
}
31+
#loc1 = loc("target.f90":1:7)
32+
#loc2 = loc("target.f90":3:18)
33+
#loc10 = loc(fused<#sp>[#loc1])
34+
35+
36+
// CHECK: define internal void @__omp_offloading{{.*}}omp_par{{.*}} !dbg ![[FN:[0-9]+]] {
37+
// CHECK-NEXT: omp.par.entry:
38+
// CHECK: #dbg_declare(ptr {{.*}}, ![[VAR:[0-9]+]], {{.*}})
39+
// CHECK-NEXT: br
40+
41+
// CHECK: ![[FN]] = {{.*}}!DISubprogram(name: "__omp_offloading_{{.*}}omp_par"{{.*}})
42+
// CHECK: ![[VAR]] = !DILocalVariable(name: "x", scope: ![[FN]]{{.*}})
43+

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